Dyson V12 Lost Suction - Service Did Not Fix It Under Warranty

I purchased a Dyson V12 cordless vacuum on December 23, 2022. Since I was satisfied with it, we ordered one for my mother on March 30, 2023. My family and I live in different cities, so I can only observe the vacuum periodically. My family members are also not familiar with handling customer service-related matters. From the beginning, my mother’s vacuum never had the same suction power as mine. The filter was replaced once, and customer service suggested that could be the issue. In October 2024, I had the filter and tube of my own vacuum replaced. When I visited in December, I noticed that my mother’s vacuum had significantly deteriorated, functioning more like a manual sweeper. The tube was also problematic, feeling as if it would break while attaching it. We contacted customer service, and they informed us that the tube and filter replacements that were previously made for my vacuum had been recorded under my mother’s vacuum, so they could not send a new one. While still under warranty, I also requested a replacement for the cyclone, which had a worn-out appearance. When I insisted that the tube issue was not our fault, they told me to include it in the package being sent to service, and that during a video call, they would confirm that it belonged to my mother’s vacuum. I initially preferred to drop it off in Ankara myself, but they insisted on arranging a courier pickup. However, when the courier arrived, they claimed the package was not suitable and said they would return the next day, but never did. When I called again, they told me that the warranty had expired, even though, as shown in the attached documents, the vacuum was purchased on March 30. They incorrectly stated that both vacuums were purchased on the same day. After I insisted, they finally agreed to assist us for free this time. However, when I visited my family again, I found that the vacuum still had the same poor suction, and the tube issue had not been addressed at all—the same tube had been returned. When I called again, they said the cyclone body had been replaced and there should be no issue with the suction. But I have the machine in my hands and can compare it with my own, and there is a clear difference. They offered to open a new service request, but they warned that it would be a paid service. However, our warranty is still valid until March 30, and even if it were not, the poor service quality must be addressed. Another request was made for the tube, but the representative handling the case did not properly record the code for my machine’s tube, meaning we are suffering due to an issue that is entirely not our fault. Were we sold a defective product from the beginning? We request urgent action regarding this matter.